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18 Everyone has JavaScript, right?
All your users are non-JS while
they're downloading your JS
If they're on a train and their net connection goes
away before your JavaScript loads, then there's no
JavaScript.
Did the HTTP request for the JavaScript complete?
Does the corporate firewall
block JavaScript?
Does their ISP or mobile operator interfere with
downloaded JavaScript?
Does their browser support the
JavaScript you’ve written?
Do your users get the JavaScript?